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Influence of electrode thickness on the performance of composite electrodes for SOFC (Articolo in rivista)

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Influence of electrode thickness on the performance of composite electrodes for SOFC (Articolo in rivista) (literal)

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Antonio Barbucci; Mariapaola Carpanese; Andrea P Reverberi; Giacomo Cerisola; Mireia Blanes; Pere Luis Cabot; Massimo Viviani; Antonio Bertei; Cristiano Nicolella (2008)
Influence of electrode thickness on the performance of composite electrodes for SOFC
in Journal of applied electrochemistry (Dordr., Online); Springer, Dordrecht (Paesi Bassi)
(literal)

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Antonio Barbucci; Mariapaola Carpanese; Andrea P Reverberi; Giacomo Cerisola; Mireia Blanes; Pere Luis Cabot; Massimo Viviani; Antonio Bertei; Cristiano Nicolella (literal)

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Dipartimento di Ingegneria Chimica e Processo, Universita` di Genova, P.le J.F. Kennedy, 16129 Genova, Italy;Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Via Giusti, 9, Firenze 50121, Italy; Departament de Qu1mica F1sica, Facultat de Qu1mica, Universitat de Barcelona, Mart1 i Franques, 1, Barcelona 08028, Spain; Istituto per l'Energetica e le Interfasi, CNR, Via De Marini, 6, Genova 16149, Italy; Dipartimento di Ingegneria Chimica, Universita` di Pisa, V. Diotisalvi 2, Pisa 56126, Italy (literal)

Titolo

Influence of electrode thickness on the performance of composite electrodes for SOFC (literal)

Abstract

Measurements on half-cells consisting of yttriastabilized zirconia (YSZ) electrolyte pellets and slurrycoated cathodes of different thickness were performed in order to determine the active area for oxygen reduction in composite cathodes of lanthanum strontium manganite (LSM) and YSZ. Electrochemical impedance spectroscopy was used to evaluate the main electrochemical parameters of the cathodic process. The temperature range was between 500 and 900 °C. The experimental results show a remarkable effect of the electrode thickness on the overall reaction rate in all the temperature range. At 750 °C a change in the controlling regime of the oxygen reduction is detectable and has been ascribed to the transition of the rate-determining step from a charge transfer to a mass transfer of the ionic species. A simplified theoretical model of the cathode that accounts for charge transfer and ionic conduction was developed to give insight into the experimental results. The model simulations compared satisfactorily with the experimental data confirming that the behaviour experimentally observed could be approached with the proposed model. (literal)

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